Osmotic device for physiological applications

Details Osmotic device for physiological applications Osmotic device for physiological applications

A - Human Necessities

61

M

128/104

A61M 35/00 (2006.01) A61F 2/16 (2006.01) A61K 9/00 (2006.01) G09B 23/30 (2006.01)

Patent

CA 1206049

ABSTRACT An osmotic device for immersion in a physiolo- gical fluid, including a semipermeable sheath defining a fully enclosed cavity and being imperforate except for a plurality of pores for permitting the flow of the physio- logical fluid into the cavity. At least one macromole- cule is disposed within the cavity and has a size larger than the pores in the sheath so that the macromolecule is prevented from leaving the cavity when the device is immersed in the physiological fluid, such physiological fluid being caused to flow into the cavity through the pores under the influence of osmotic pressure. The cavity will always contain a molecular concentration greater than the molecular concentration of physiological fluid surrounding the sheath.

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